When the Tokyo subway cars are running at their daily 200% of capacity*, please line up and wait your turn to get kicked in the head.
View the original poster above for January 2013 at the Tokyo Metro Manners Foundation.
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Daily Mail | 19 November 2012: Photos reveal squashed Tokyo subway commuters squeezed on to trains
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*Business Insider | Jan. 11, 2012: Take A Look At Why The Tokyo Metro Is Known As 'Commuter Hell'

I like the engrishy flavor of the copy on the subway poster…
…that should read, “Why do you ignore those waiting
by cutting into line?”
Spotted on today’s Reddit.com/r/japan:
Just in case you were thinking of bringing dynamite or a large quantity of matches on Tokyo Metro